The difference between a DC and an AC generator is that
a.
the DC generator has one unbroken slip ring.
b.
the AC generator has one unbroken slip ring.
c.
the DC generator has one slip ring split in two halves.
d.
the AC generator has one slip ring split in two halves.
e.
the DC generator has two unbroken slip rings.
c
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In a single slit diffraction experiment, how does the angle to the first dark fringe depend on the wavelength of the light used?
A. The angle increases as the wavelength increases. B. The angle decreases as the wavelength increases. C. The angle increases as the wavelength decreases. D. The angle does not depend on the wavelength of the light.
Most stars in the Milky Way's halo are
A) very old. B) found inside molecular clouds. C) very young. D) blue or white in color.
Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200-kg car
(a so-called compact model) to a rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph). (Bumpers are built with springs that compress to provide a stopping force without, hopefully, denting the metal.) A) 1.8 × 104 N B) 1.6 × 104 N C) 5.4 × 104 N D) 6.5 × 105 N E) 3.2 × 104 N
A rotating flywheel can be used as a method to store energy. If it has 2.0 × 10^6 J of kinetic energy when rotating at 400 rad/s, and if a frictional torque of 4.0 Nm acts on the system, in what interval of time would the flywheel come to rest?
a. 3.5 min c. 14 min b. 42 min d. 21 min